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Durston Gear Kakwa 55 vs Osprey Sirrus 36

Weight and specs compared for 2026 — and which one to choose.

Durston Gear Kakwa 55 is the lighter option — 381 g lighter than the Osprey Sirrus 36 (31% less weight). If grams matter to you, that is the one to beat.
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Spec Durston Gear Kakwa 55 Osprey Sirrus 36
Weight 839 g · 0.839 kg · 1.85 lb 1,220 g · 1.220 kg · 2.69 lb
Brand Durston Gear Osprey
Category Backpack Backpack
Durston Gear Kakwa 55
839 g

Versatile 55L lightweight pack in UltraGrid fabric with aluminum frame stays. Excellent load transfer for heavier loads up to 40 lbs.

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Osprey Sirrus 36
1,220 g

Women's ventilated 36L pack with AirSpeed back panel.

Full details →

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Durston Gear Kakwa 55 vs Osprey Sirrus 36: which should you buy?

If saving weight is your priority, the Durston Gear Kakwa 55 wins — at 839 g it is 381 g (31%) lighter than the Osprey Sirrus 36 (1,220 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest backpack page, or browse the full gear weight database.

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